Structural evolution of spark plasma sintered AlFeCuCrMgx (x = 0, 0.5, 1, 1.7) high entropy alloys

Maulik, Ornov, Kumar, Devesh, Kumar, Saurav, Fabijanic, Daniel M. and Kumar, Vinod 2016, Structural evolution of spark plasma sintered AlFeCuCrMgx (x = 0, 0.5, 1, 1.7) high entropy alloys, Intermetallics, vol. 77, pp. 46-56, doi: 10.1016/j.intermet.2016.07.001.

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Title Structural evolution of spark plasma sintered AlFeCuCrMgx (x = 0, 0.5, 1, 1.7) high entropy alloys
Formatted title Structural evolution of spark plasma sintered AlFeCuCrMgₓ (x = 0, 0.5, 1, 1.7) high entropy alloys
Author(s) Maulik, Ornov
Kumar, Devesh
Kumar, Saurav
Fabijanic, Daniel M.ORCID iD for Fabijanic, Daniel M.
Kumar, Vinod
Journal name Intermetallics
Volume number 77
Start page 46
End page 56
Total pages 11
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-10
ISSN 0966-9795
Keyword(s) high entropy alloy
spark plasma sintering
transmission electron microscopy (TEM)
phase transformation
Summary The present paper reports synthesis of novel AlFeCuCrMgx (x = 0, 0.5, 1, 1.7 mol) high entropy alloys (HEAs) by mechanical alloying (MA) followed by spark plasma sintering (SPS). Phase evolution, microstructure and phase transformation study of the sintered alloy were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). XRD of the sintered alloys revealed the formation of two BCC phases in the AlFeCuCr alloy and more complex structures in AlFeCuCrMgx (x = 0.5, 1, 1.7) alloys containing AlFe type, BCC, and Cu2Mg type phases. TEM bright field image and selected area diffraction pattern (SAED) revealed the formation of tetragonal closed packed Cr precipitates within the Cu2Mg phase of AlFeCuCrMgx alloys (x = 0.5, 1, 1.7). DSC study of the alloys revealed no substantial phase change up to 1000 °C for AlFeCuCr alloy. Although, for x = 0.5, 1 & 1.7 phase transformation occurs at 818 °C, 885 °C & 483 °C respectively. Mg content had a significant effect on hardness, increasing to a peak hardness of 853 HVN for AlFeCuCrMg0.5 alloy before decreasing to 533 HVN for the AlFeCuCrMg1.7 alloy. The phase evolution in these alloys has been considered using thermodynamic parameters, and the structure-property relationship has also been proposed by conventional strengthening mechanisms.
Language eng
DOI 10.1016/j.intermet.2016.07.001
Field of Research 091207 Metals and Alloy Materials
0306 Physical Chemistry (Incl. Structural)
0914 Resources Engineering And Extractive Metallurgy
0912 Materials Engineering
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Crown Copyright
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Document type: Journal Article
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